Cirrus DESIGN SR20 Information Manual page 201

Cirrus Design Section 7
SR20 Airplane Description
Pressure indicator receives a pressure signal from an oil pressure
sensor on the left side of the engine. Normally, oil pressure may drop
to 10 psi at idle but will be in the 30 - 60 psi range at higher RPM.
Fuel Flow / Manifold Pressure Gage
A 2¼" combination Fuel Flow and Manifold Pressure indicator is
mounted on the right instrument panel immediately below the
tachometer. The indicator is internally lighted. 28 VDC for instrument
operation is supplied through the 5-amp ENGINE INST circuit breaker
on the Essential Bus.
The Fuel Flow pointer sweeps a scale marked from 0 to 18 Gal/Hr.
Refer to Section 2 (Limitations) for instrument limit markings. The
electrically operated Fuel Flow indicator receives a fuel-flow rate
signal from a fuel-flow transducer installed in the fuel line between the
throttle body metering valve and the injector manifold (spider).
The Manifold Pressure pointer sweeps a scale marked from 10 to 35
inches Hg in 5-inch Hg increments. Refer to Section 2 (Limitations) for
instrument limit markings. The electrically operated manifold pressure
indicator receives a pressure signal from a pressure sensor mounted
in the induction airstream on the left side of the induction air manifold.
Oil Warning Light
The red OIL warning light in the annunciator panel comes on to
indicate either high oil temperature or low oil pressure. The light is
illuminated by a switch in the oil temperature gage if the oil
temperature reaches 240° F or by a switch in the oil pressure gage if
the oil pressure drops to 10 psi or less. If the OIL warning light comes
on in flight, refer to the oil temperature and pressure gages to
determine the cause. Typically, low oil pressure will be accompanied
by a high oil temperature indication. The light is powered by 28 VDC
through the 2-amp ANNUNC circuit breaker on the Essential Bus.
P/N 13999-002 Info Manual 7-39
September 2011